This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A202222 #6 Mar 30 2012 17:30:01 %S A202222 1,2,6,24,119,708,4914,38976,347795,3448312,37608186,447452544, %T A202222 5767315785,80054392880,1190583423414,18887010379776,318343175603145, %U A202222 5681348801115680,107025793890636390,2122275973981599744,44188021441868910375,963852638874607648320 %N A202222 Number of permutations avoiding the consecutive pattern 23451. %C A202222 a(n) is the number of permutations on [n] that avoid the consecutive pattern 23451. It is the same as the number of permutations which avoid 13452, 25431, 41235, 53214, 13542, 24531, 42135, 53124, 14352, 25341, 41325, 52314, 14532, 23541, 43125, 52134, 15342, 24351, 42315, 51324, 15432, 43215 or 51234. %H A202222 Ray Chandler, <a href="/A202222/b202222.txt">Table of n, a(n) for n = 1..40</a> %H A202222 A. Baxter, B. Nakamura, and D. Zeilberger. <a href="http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/auto.html">Automatic generation of theorems and proofs on enumerating consecutive Wilf-classes</a> %Y A202222 Cf. A177523, A202213-A202236. %K A202222 nonn %O A202222 1,2 %A A202222 _Ray Chandler_, Dec 15 2011